If x = 10, then find the value of (4x2 + 20x + 25).

(4x2 + 20x + 25)By using (a + b)2 = a2 + b2 + 2ab,We get;= (2x)2 + (5)2 + 2(2x)(5)= (2x + 5)2= (2(10) + 5)2= (20 + 5)2= (25)2= 625

Q19 of 95 Page 94

If x = 10, then find the value of (4x² + 20x + 25).

(4x² + 20x + 25)

By using (a + b)² = a² + b² + 2ab,

We get;

= (2x)² + (5)² + 2(2x)(5)

= (2x + 5)²

= (2(10) + 5)²

= (20 + 5)²

= (25)²

= 625

(82)² – (18)² = ?

(197 × 203) = ?

If (a + b) = 12 and ab = 14, then (a² + b²) = ?

If (a - b) = 7 and ab = 9, then (a² + b²) = ?