Solve 5x^2 = 10x + 4 , to 2 decimal places.
First rearrange to get 5x2 - 10x - 4 = 0 , by subtracting 10x and 4 from both sides of the equation. Here, we can use the quadratic formula which is x = -b+- sqrt(b2 -4ac) / 2a. In our question a=5 , b=-10 , c=-4. Substituting these into the formula x = - (-10) +- sqrt(-102 -45-4)/2(5) =10+-sqrt(100+80) / 10 =10+- sqrt(180) / 10 So, x= 2.34, -0.34
AP
Related Maths GCSE answers
All answers ▸A triangle has sides of length 8 cm, 10 cm and 14 cm. Work out the size of the largest angle of the triangle. Give your answer correct to 1 decimal place.
Share £650 in the ratio 8:5
Work out 2(3/4)*1(5/7). Give your answer in mixed number form.
Prove that 1/sin(2theta) - cos(2theta)/sin(2theta) = tan(theta)