Solve the quadratic equation: 5x2+8x+2
Here you need to use the quadratic formula, it cannot be solved by expanding out the brackets. In the formulae for which can be found on the formulae sheet. In this case a=5, b=8 and c=2.
This gives: x=(-8±√(82-(4x5x2)))/(2x5)
This simplifies to x=(-8±√24)/10
The plus or minus sign shows there are two possible solutions.
For x=(-8+√24)/10, x=0.3
For x=(-8-√24)/10, x=-1.3
LP
Related Maths GCSE answers
All answers ▸2a + 6b = 24, 3a + b = 20
Solve these simultaneous equations: 2x + 5y = 37 and y = 11 - 2x
A)Write x^2 – 8x + 25 in the form (x – a)^ 2 + b. (B) Write down the coordinates of the turning point of the graph of y = x2 – 8x + 25. (C)Hence describe the single transformation which maps the graph of y = x2 onto the graph of y = x2 – 8x + 25.
Insert a pair of brackets into this question to make it correct 2 + 5 x -6 = -42