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16x2 + 40x + 25 |
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Answer» _40 +/- √40×40_ 4×16×25/2×16 We need to select one pair from the top list and one pair from the bottom list. It is usually smart to start with the pairs that have two numbers close in value. So let's try(5,5)with(4,4). (4x+5)(4x+5)=16x²+20x+20x+25 =16x²+40x+25 This one worked! Hence, the factored form is: (4x+5)(4x+5)=(4x+5)² Solving: (4x+5)²=0 4x+5=0 4x=−5 x=−5/4 so both are correct answer s |
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