You have to analyze two cases:
a) 4x^2 - 7x - 9 = 11 - 6x - 5x^2
9x^2 - x - 20 = 0
b) -(4x^2 - 7x - 9) = 11 - 6x - 5x^2
x^2 + 13x + 2 = 0
And use a technique like the quadratic formula to find the roots.
There are technically four combinations for positives and negatives, but when both are negative, it is equivalent to a) and when the right is negative and the left is positive, it is equivalent to b) [because you can multiply on both sides by -1)
a) 4x^2 - 7x - 9 = 11 - 6x - 5x^2
9x^2 - x - 20 = 0
b) -(4x^2 - 7x - 9) = 11 - 6x - 5x^2
x^2 + 13x + 2 = 0
And use a technique like the quadratic formula to find the roots.
There are technically four combinations for positives and negatives, but when both are negative, it is equivalent to a) and when the right is negative and the left is positive, it is equivalent to b) [because you can multiply on both sides by -1)
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its called do your homework yourself...