What is the equation for the axis of symmetry of a quadratic function y = 3x² + 6x + 2? A. x = -1 B. x = -2 C. x = -3 D. x = -4 相关知识点: 试题来源: 解析 A。解析:For the function y = 3x² + 6x + 2, a = 3 and b = 6. Using the formula x = -b/...
Here is the general formula for reflecting across the y-axis: A point {eq}(x,y) {/eq} being reflected over the y-axis will be reflected to {eq}(-x,y) {/eq}. The y-coordinate in this case is unchanged, but the x-coordinate changes sign. The intuition behind this reflection is ...
For a focused transducer, the KZK equation is in theory valid for waves traveling within 15–16 degrees of the nominal axis of the beam (typically is the z-axis) [63]. The parabolic form of the wave equation can be solved with efficient numerical techniques, which is the main advantage ...
For example, the integer solutions of the equation x2 + y2 = z2 are of the form x = m2 –n2; y = 2mn; z = m2 + n2, where m and n are integers. Let F and Φ be mappings of a set A into a set B. From the most general point of view, an equation is the statement ...
X_b = np.concatenate([np.ones((len(X), 1)), X], axis=1) # calculate normal equation theta_best = np.linalg.inv(X_b.T.dot(X_b)).dot(X_b.T).dot(y) # best values for theta intercept, *coef = theta_best print(f"Intercept: {intercept}\n\ ...
What is the equation for a vertical line? The slope is undefined ... and where does it cross the Y-Axis? In fact, this is a special case, and we use a different equation, not "y=...", but instead we use "x=...". Like this: x = 1.5 Every point on the line has x coordi...
The x axis is aligned with the direction of the mean velocity um, and the derivation has to be extended to include pivoting. For the case where um is constant, and neglecting density variations which are at maximum of the order of 30% (see Figure 1.5), this equation reduces to: Sign...
作者: Y Wang 摘要: The axisymmetric problem of an external circular crack in a threedi-mensional infinite elastic body and under the unsymmetric loads is investi-gated by using the boundary integral equation method.The dislocations ofcrack surfaces and the exact solutions of stress intensity ...
The equation for a line is of the form y=mx+b, where m represents the slope and b represents the intersection of the line with the the y-axis. This article will show by an example how we can write an equation for the line that has a given slope and passes through a given point....
(7.57) provides enough information to solve for B, leading to a formula known as Ampère’s law. Thus, consider a wire placed along the z-axis of a Cartesian system, with a total current I flowing through it in the +z direction. The current could be thought of as a current density ...