(4x^2+15) (4x^2+5) by using identity
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Answer:
Identity is
(x+a)(x+b)=x²+(a+b)x+ab
Step-by-step explanation:
(4x²+15)(4x²+5)
(4x²)²+(15+5)(4x²)+15(5)
16x⁴+20(4x²)+75
16x⁴+80x²+75
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