Q33 of 128 Page 224

The value of (a + b)2 – (a – b)2 is

(a) 4ab (b) – 4ab (c) 2a2 + 2b2 (d) 2a2 – 2b2

(a + b)2 - (a – b)2


⇒ a2 + b2 + 2ab - a2 - b2 + 2ab


⇒ 4ab


More from this chapter

All 128 →
31

The value of (3x3 +9x2 + 27x) ÷ 3x is

(a) x2 +9 + 27x (b) 3x3 +3x2 + 27x


(c) 3x3 +9x2 + 9 (d) x2 +3x + 9

 32

The value of (a + b)2 + (a – b)2 is:

(a) 2a + 2b (b) 2a – 2b (c) 2a2 + 2b2 (d) 2a2 – 2b2

 34

Fill in the blanks to make the statements true:

The product of two terms with like signs is a………… term.

 35

Fill in the blanks to make the statements true:

The product of two terms with unlike signs is a …………….. term.