Question

(5x+3y)²-(2x-y)(4x-9y)

Answer 1

Ответ:

(5x + 3)²- (2x - y)(4x-9y)

(8x)²-(8x²-6xy-4xy+3y²)

64x²-(8x²-6xy - 4xy+3y²)

64x²-(8x²-10xy+3y²)

64x²-8x²+10xy-3y²

64x²-8x²

(64 - 8)x²=56²

56x²+10xy-3y²