Question

Choose the correct answer:
The difference (0.7)²- (0.3)² simplifies to
A. 0.4
B. 0.04
C. 0.49
D. 0.56

Answer 1

a² - b² = (a+b)(a-b)

so
(0.7)² - (0.3)²
= (0.7+0.3) × (0.7 - 0.3)
= 1 × 0.4
= 0.4

Answer 2

Answer:

(A) 0.4

Step-by-step explanation:

Applying the Algebraic Identify a² - b²  = (a + b) (a - b)

(0.7)²- (0.3)² = (0.7 + 0.3)(0.7 - 0.3)

0.7)²- (0.3)² = (1) (0.4)

0.7)²- (0.3)² = 0.4

Answer: 0.4 (OPTION A)