Advertisements
Advertisements
Question
Use the product (a + b) (a – b) = a2 – b2 to evaluate:
7.7 x 8.3
Sum
Advertisements
Solution
7.7 x 8.3 = (8−0.3) (8+0.3)
= (8)2 − (0.3)2
= 64 − 0.09
= 63.91
shaalaa.com
Product of Sum and Difference of Two Terms
Is there an error in this question or solution?
APPEARS IN
RELATED QUESTIONS
Evaluate : (3−2x) (3+2x) (9+4x2)
Use the product (a + b) (a – b) = a2 – b2 to evaluate:
21 x 19
Evaluate: (6 – xy) (6 + xy)
Evaluate : `(7"x"+2/3"y")(7"x"-2/3"y")`
Evaluate : `("a"/(2"b")+(2"b")/"a")("a"/(2"b")-(2"b")/"a")`
Evaluate: (2a + 3) (2a − 3) (4a2 + 9)
Evaluate : (9a − 7b) (3a − b)
Evaluate: (3a2 − 4b2) (8a2 − 3b2)
Evaluate: (4x2 − 5y2) (4x2 + 5y2)
Evaluate: (m + 3) (m − 3) (m2 + 9)
