maths doubt
Asked by shamalmoghekar | 3rd Nov, 2020, 04:25: PM
Expert Answer:
1.
(a - b) = 7
Squaring on both the sides, we get
→ a2 - 2ab + b2 = 49
→ a2 + b2 = 49 + 2ab = 49 + 2(9) = 67....(ab = 9)
2.
(2x + 3)(3x - 1)
=2x(3x - 1) + 3(3x - 1)
= 6x2 - 2x + 9x - 3
= 6x2 + 7x - 3
Note: Please ask one question in one query.
Answered by Yasmeen Khan | 3rd Nov, 2020, 05:04: PM
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