Answer:
According to me it should be, -2x² + 12x - 7
Step-by-step explanation:
you gotta multiply "-" between two equations by the second equation which simplifies to (x² + 5x - 6) + (-3x² + 7x - 1). Now if the two equations are simplified together:
⇒ x²- 3x² = -2x²
⇒ 5x + 7x = 12x
⇒ (-6) + (-1) = -7
Putting it all in one equation will result in: -2x² + 12x - 7
Hope this helps, good luck!
The second shape is 3 times bigger than the first which means side DA is 45cm long.
1.
( x - 5 ) / x - 1 = ( x + 3 ) / x / · x ( we will multiply both sides by x )
x - 5 - x = x + 3
- x = 3 + 8
- x = 8
x = - 8
Answer: D ) 8
2.
2/(8 x²) = 1/ 8 x / · x
2 / 8 x = 1 / 8
8 x = 16
x = 16 : 8
x = 2
Answer: D ) 2
3.
( x + 4 )/ x + 1 = ( x + 6 ) / x / · x
x + 4 + x = x + 6
x = 6 - 4
x = 2
Answer: B ) 2
4.
1 / 6 = 3 / ( x + 12 )
x + 12 = 18
x = 18 - 12
x = 6
Answer: A ) 6