2x2 +3x -7 =x2 +5x +39
2x2 +3x -7 -x2 -5x -39=0
x2 - 2x -46 =0
(x-1)2 -46 -1 =0
(x-1)2 -47=0
(x-1)2 = 47
x-1= + or - the square root of 47
x= 1 + or - the square root of 47
{5/33, -1/5} is the answer
Answer:
Hope the below answer is easy to understand
Step-by-step explanation:
1) Given the four angles of a quadrilateral are in the ratio 1:2:3:4
Then Let the angles are x,2x,3x and 4x
We know that total of four angles of a quadrilateral =360 °
∴x+2x+3x+4x=360 °
⇒10x=360 °
⇒x=36 °
hence the measures of angles are 36 ° ,72 ° ,108 ° ,144 °
2) Measure of interior angle of a polygon= 180°.
Sides of the polygon = 7 sides
Therefore,
Interior angle of the polygon having 7 sides = 180/7 = 25 5⁄7°