(2a 7)(2a 7) Expanding 2a+2a× ( 7)+( 7)×(2a)+( 7)×( 7) =4a^2 14a 14a+49 =4a^2 28a+49 ...

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Properties of Square Numbers

Expand2 a-72 ...

Question

Expand $(2 a - 7) (2 a - 7)$

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Solution

$(2 a - 7) (2 a - 7)$
Expanding $(2 a \times 2 a) + (2 a \times (- 7)) + ((- 7) \times 2 a) + ((- 7) \times (- 7))$
$= 4 a^{2} - 14 a - 14 a + 49$
$= 4 a^{2} - 28 a + 49$

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