Question

(67)²,Find the value using expansion formulae of (a+b)² or (a-b)².

Answer 1

BONJOUR ,
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we can write this like (60+7)^2
$(60 + 7) {}^{2} \\ 60 {}^{2} + 2 \times 60 \times 7 + 7 {}^{2} \\ 3600 + 840 + 49 \\ = 4129$

Answer 2

$\textbf {Hey there, here is the solution.}$

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(67)²

.

Write it in expanded form:

= (70 - 3)²

.

Apply (a - b)² = a² - 2ab + b²:

= (60)² - 2(60)(3) + (3)²

.

Evaluate each bracket:

= 3600 - 360 + 9

.

Sum them up:

= 3249

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Answer: 3249

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⭐$\textbf {Cheers}$⭐