Simplify (x2 + 54x- 15) – (x2 – 9y +12) + ( 4x – x 2)
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(x² + 54x- 15) – (x² – 9y +12) + ( 4x – x²)
= x²+54x-15-x²+9y-12+4x-x²
= 58x-x²-27+9y
Hope it helps!!
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