solved question
SOLVED EXAMPLES
Question 1: Find out the value of 52 – 32Solution:
Using the formula a2 – b2 = (a – b)(a + b)
where a = 5 and b = 3
(a – b)(a + b)= (5 – 3)(5 + 3)= 2 $\times$ 8= 16
Question 2: 43 $\times$ 42 = ?
Solution:Using the exponential formula (am)(an) = am+nwhere a = 4
43 $\times$ 42= 43+2= 45= 1024
Using the formula a2 – b2 = (a – b)(a + b)
where a = 5 and b = 3
(a – b)(a + b)= (5 – 3)(5 + 3)= 2 $\times$ 8= 16
Question 2: 43 $\times$ 42 = ?
Solution:Using the exponential formula (am)(an) = am+nwhere a = 4
43 $\times$ 42= 43+2= 45= 1024
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