find the zeros of 7x^2 (7x square) + 9x - 2980
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7x^2+9x-2980
7x^2+149x-140x-2980
x(7x+149)-20(7x+149)
x-20=0. | 7x+149=0
x=20. |7x=-149
x=-149/7
7x^2+149x-140x-2980
x(7x+149)-20(7x+149)
x-20=0. | 7x+149=0
x=20. |7x=-149
x=-149/7
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