Question

find the following equation by quadratic method?
${7b } ^ {2} - 9b + 15 = 0$
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Answer 1

There are two pics attached. Hope it will help you

Answer 2

Answer:

Step-by-step explanation:

Given that,

7b² - 9b + 15 = 0

Comparing the given equation with ax² + bx + c = 0,

We have, a = 7 , b = - 9 and c = 15.

By using formula, x = - b ± √ b² - 4ac / 2a

∴ b = - ( - 9 ) ± √( - 9 )² - 4 ( 7 ) ( 15 ) / 2 ( 7 )

= 9 ±√ 81 - 420 / 14

= 9 ± √ - 339 / 14