Question

the zero of 5 x square +21 x -20​

Answer 1

Answer:

x = 4/5 , - 5 ans.

Step-by-step explanation:

5x² + 21x - 20

5x² - 4x + 25x - 20

x( 5x - 4 ) + 5( 5x - 4 )

(5x - 4)(x + 5)

5x - 4 = 0 x + 5 = 0

x = 4/5 x = -5

x = 4/5 , - 5 ans.

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Answer 2

Step-by-step explanation:

Just use the quadratic formula, you will get

x = (-21 + √841)/10 or (-21-√841)/10