–5x²+38x–21 factorise step by step
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STEP BY STEP EXPLANATION :
-5x^2 + 38x - 21 = 0
multiply by - both sides
so, 5x^2 - 38x + 21 = 0
5x^2 - ( 35 + 3 ) x + 21 = 0
5x^2 - 35x - 3x + 21 = 0
5x( x - 7 ) -3 ( x - 7 ) = 0
(5x - 3 ) ( x- 7 ) = 0
x= 3/5 or x = 7
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