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find the values of x when 3x^2 - 6x - 9

First we will need to factorise the equation. Start with the 3x^2 term and notice 3 is prime so must have 3x and x terms. (3x - 9) (x + 1) or (3x + 3) (x - 3) Setting the brackets to 0 gives us 3x - 9 = 0 an...
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Answered by Dylan M. • Maths tutor
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Solve the simultaneous equations: 4x + 7y = 1, 3x + 10y = 15.

4x + 7y = 1 1. 3x + 10y = 15 2. 1. x 3 (4x x 3) + (7y x 3) = 1 x 3 12x + 21y = 3 3. 2. x 4 (3x x 4) + (10y x 4) = 15 x 4 12x + 40y = 60 4. 4. - 3. (12x - 12x) + (40y - 21y) = 60 - 3 19y = 57 y = 57/19 y = 3 ...
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Answered by Isabelle J. • Maths tutor
6399 Views

Describe the mechanism of inhalation.

The external intercostal muscles contract, pulling the ribs upwards and outwards. At the same time the muscles of the diaphragm contract, pulling the diaphragm down and causing it to flatten. Both of these a...
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Answered by Isabelle J. • Biology tutor
23213 Views

What is the effect of increasing the temperature on the rate of reaction?

As the temperature has increased the particles have more kinetic energy which causes them to move more quickly so there are more collisions per unit time. Also, due to their increased kinetic energy, more pa...
IJ
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Make x the subject of the equation: y = 4(x+2)/5x-1

1st multiply out the brackets: y = 4x + 8 / 5x - 1 Next multiply both sides by the denominator onf the RHS: y(5x-1) = 4x + 8 Again, multiply out the brackets: 5xy - y = 4x + 8 Rearrange the equation so that ...
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Answered by Nikilesh R. • Maths tutor
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