(2a 7)(2a 7) Expanding the bracket, we have 2a × 2a + 2a × ( 7) + ( 7) × (2a) + ( 7) × ( 7) = 4a^2 14a 14a +49 =4a^2 28a +49 ...

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Properties of Square Numbers

Expand: 2a-72...

Question

Expand: (2a-7)(2a-7)

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Solution

(2a-7)(2a-7)
Expanding the bracket, we have
$2 a \times 2 a + 2 a \times (- 7) + (- 7) \times (2 a) + (- 7) \times (- 7) = 4 a^{2} - 14 a - 14 a + 49 = 4 a^{2} - 28 a + 49$

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