Question

25 minus 4 y square + 21 y​

Answer 1

25 - 4y² + 21y

if the question is to find the value of y, the answer is as follows

let the expression equals to 0

25 - 4y² + 21y = 0

4y²- 21y - 25 = 0

4y² - 25y + 4y - 25 = 0

4y² + 4y - 25y - 25 = 0

4y (y+1) - 25 (y+1) = 0

(y+1) (4y-25) = 0

y+1 = 0

y = -1

and

4y - 25 = 0

y = 25/4

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