7x^3. That is 7x cubed.... or 7x*7x*7x (where * means multiply).
You should get 343x
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(x2 + 7x - 18) = (x + 9)(x - 2)
Answer : 12
It is (x+3)(x+4) when factored
49/4 or 12.25
x2 +7x = 30 x2 +7x - 30 = 0 (x + 10)(x - 3) = 0 Now: x + 10 = 0 or x - 3 = 0 So: x = -10 or x = 3