Mathematics: If a+b=5 and a-b=4 then b^2-a^2 =

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If a+b=5 and a-b=4 then b^2-a^2 = - id542214600191, kulfif8441

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ReonRamseyz

17.10.2021

$a + b = 5 \\ a \: = 5 - b \\ a - b = 4 \\ 5 - b - b = 4 \\ 5 - 2b = 4 \\ 5 - 4 = 2b \\ 1 = 2b \\ \frac{1}{2} = \frac{2b}{2} \\0.5 = b \\ b = 0.5 \\ a = 5 - b \\ = 5 - 0.5 \\ = 4.5 \\ {a \: }^{2} - {b}^{2} = ( {4.5}^{2}) - ( {0.5}^{2} ) \\ = 20.25 - 0.25 \\ = 20 \\ {a}^{2} - {b}^{2} = 20$

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If a+b=5 and a-b=4 then b^2-a^2 =

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