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Find the value of x: 2x^2 - 3x - 4 = 1

2x^2 - 3x - 4 = 1 To solve, we should bring all the terms to one side, and equate the equation to 0. To do this, we should subtract 1 from each side. 2x^2 - 3x - 4 - 1 = 1 - 12x^2 - 3x - 5 = 0 Next, we shoul...
PS
Answered by Prithvie S. • Maths tutor
4564 Views

If Angela gets 50p change from a £2 coin, how much is 250g of butter? (full details below)

Angela wants to bake a cake. She needs:250g flour250g sugar3 eggs125g butterEach costs:1kg flour 90p1kg sugar £1.206 eggs £1.15250g butter xShow your working.(0.25 x 0.9) + (0.25 x 1.2) + (0.5 x 1.15) + 0.5x...
NM
Answered by Natalie M. • Maths tutor
3625 Views

The equation kx^2+4kx+5=0, where a is a constant, has no real roots. Find the range of possible values of k.

First, if k=0 then the equation has no real roots since in this case we would have 5=0 (this is a proof by contradiction). A quadratic equation of the form ax^2+bx+c=0 has no real roots if the discriminant b...
EN
Answered by Emily N. • Maths tutor
14397 Views

Expand the following brackets, (6x^2-4)(2x+3)

12x 3 +18x 2 -8x-12
SP
Answered by Sophie P. • Maths tutor
4195 Views

Work out 70% of 140 (Non-calculator)

70% of 140 can be split up into 50% of 140 and 2 lots of 10% of 140. 50% of 140 is the same as 140 divided by 2, which equals 70. 10% of 140 is the same as 140 divided by 10, which gives 14. Therefore 70 + 1...
JP
Answered by Jake P. • Maths tutor
7482 Views