For the x intercepts, y = 0 ie 0 = 2x2 + 2x - 4
or x2 + x - 2 = 0 so that (x + 2)*(x - 1) = 0
So the intercepts are (-2,0) and (1,0)
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2x2 + 11x + 15 = (x + 3)(2x + 5).
Yes
x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0
2x2 + 3x - 20 = (x + 4)(2x - 5).
2x2 + 10 = 9x 2x2 - 9x + 10 = 0 (x - 2)(2x - 5) = 0