3. Find the product of given binomials (5x + 4y)(4y – 5x) and evaluate the product for X=1 Y= -1
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Step-by-step explanation:
(5x + 4y)(4y - 5x)
= 5x(4y - 5x) + 4y(4y - 5x)
= 20xy - 5x by power of 2 + 4y by power of 2 - 20yx
= -25x by power of 2 + 16y by power of 2
= -25(1) by power of 2 + 16(-1) by power of 2
= -25 * 1 + 16 * 1
= -25 + 16
= -9
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