Question

6. If 2x + y = 14 and xy = 6, find the value of
4x² + y2.
7. If a + b2=29 and ab=2, find the value of a-b.​

Answer 1

Step-by-step explanation:

6. 2x+ y = 14

squaring both sides

(2x + y)² = 14²

4x² + 4xy + y² =196

4x² + y² =196 -4xy

putting value of xy=6

4x² + y² =196 - 4×6

4x² + y² =196 - 24

4x² + y² = 172