Question

x² + x - 20=0 completing square method by digest












​

Answer 1

Step-by-step explanation:

Solution:

sin 2x = 2 sin x cos x

Since cos x = 3/5, sin x = 4/5. (Basic trig)

Thus, sin 2x = 2(3/5)(4/5) = 24/25

Answer 2

Step-by-step explanation:

x^2+x-20=0

=> x^2+5x-4x-20=0

=> x(x+5)-4(x+5)= 0

=> (x+5)(x-4)= 0

So x= -5.(or) x= 4

hope it helps ✌