Question

(6) 4x2 + 2.8x + 0.49​

Answer 1

Answer:

x=-7/20

Step-by-step explanation:

4x^2+2.8x+0.49=0

4x^2+28/10+49/100=0

(400x^2+280x+49)/100=0

400x^2+280x+49=0

400x^2+140x+140x+49=0 (middle term factorisati9n)

20x(20x+7) +7(20x+7)=0

(20x+7)(20x+7)=0

and20x+7=0

20x=-7

x=-7/20