17x2+18xy−7y2−16x−32y−18=0
The rotation angle:
tan2θ=A−CB
where A, B and C are the corresponding coefficients from the equation:
Ax2+Bxy+Cy2+Dx+Ey+F=0
tan2θ=1+718=43=1−tan2θ2tanθ
tanθ=31
The required transformation equations needed to rotate the coordinate axes to eliminate the xy
term in the given equation for the conic section are:
x=x′cosθ−y′sinθ
y=x′cosθ+y′sinθ
cosθ=3/10,sinθ=1/10
x=103x′−y′,y=10x′+3y′
Substituting these expressions for x and y into the original equation for the conic section and simplifying, we get:
20x′2−10y′2−1080x′−1080y′−18=0
Simplifying and completing the squares to obtain an equation for a hyperbola in standard form, we get:
1/2(x′−2/10)2−1(y′+4/10)2=1
Comments
Leave a comment