Question

9. Using the formula (a - b)2 = (a? - 2ab + b²), evaluate:
(1) ( 630)^2
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Answer 1

Answer:

$(625 + 5) {}^{2} \\ 625 {}^{2} - 2 \times 625 \times 5 + 5 {}^{2} \\ 390625 - 6250 + 25 \\ 384,400answer$

Answer 2

Answer:

396900

Step-by-step explanation:

(700-70)^2

= 700^2 -2*700*70+ 70^2

= 490000-98000 + 4900

= 396900

Done using (a-b)^2