Question 84 (x)
Simplify
(b2−49)(b+7)+343
We have, (b2−49)(b+7)+343=b2(b+7)−49(b+7)+343=b3+7b2−49b−343+343=b3−49b+7b2
Question 84 (b)
Simplify [(711)5÷(711)2]×(711)2
Question 84 (iii)
(79a+97b)2−ab
Question 84 (vii)
(x2−4)+(x2+4)+16
Question 84 (ii)
(3x+2y)2−(3x−2y)2