Question

find the roots of 4 x square + 3 X + 5 = 20 by the method of completing square ​

Answer 1

Answer:

$4 {x}^{2} + 3x + 5 = 20$

$4 {x}^{2} + 3x - 15 = 0$

${(2x)}^{2} + 2 \times 2 \times \frac{3}{4} x - 15 = 0$

Step-by-step explanation:

${(2x)}^{2} + 2 \times 2 \times \frac{3}{4} x + { (\frac{3}{4}) }^{2} - { (\frac{3}{4} )}^{2} - 15 = 0$

equal to zero