Expression 3x²+4x-5
x=0​

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

If the value of cos330°is√3/2 then find cos 165°.

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat