Question

answer of 7x + 3x - 20 = 70
solve by tilk and trail method

Answer 1

Answer:

Here's our answer

Step-by-step explanation:

3x² + 7x- 20 = 0

dividing by 3 we get.

x² + 7/3x - 20/3 =0

3rd term =(1/2 × coefficient of x)²

=(1/2 × 7/3) (1/2 × 7/3)

=(7/6) (7/6)

=49/36

adding on both sides.

x² + 7/3x + 49/36 = 20/3 + 49/36

x² + 7/3x + (7/6)² = 289/36

x + 7/6 = 17/6

x = 10/6

x = 5/3

Hope you understand.

Answer 2

Answer:

$= 7x + 3x - 20 = 70 \\ = 10x - 20 = 70 \\ = 10x = 70 + 20 \\ = 10x = 90 \\ = x = 90 \div 10 \\ = x = 9$