find the value of a square + b square when a + b = 5 and ab =4
Answers
Answered by
0
Answer:
a²+b²=21.
Step-by-step explanation:
(a+b)²= a²+b²+ab
5²=a²+b²+4
25-4=a²+b²
21=a²+b².
a²+b²=21.
Answered by
0
a^2+b^2 = ?
ab =4
a + b = 5
(a + b )^2 =5^2 =25 = a^2+2ab+b^2
a^2+b^2 = 25- 2×4
= 17
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