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We have one linear and one quadratic equation here. Since we have a quadratic, we will have two sets of solutions. Let's solve by substitution. Substitute equation (1) into equation (2), which yields:x + ...

In order to compare the prices of each of these brands of rice, we will work out how much it costs to buy 100g of each brand - by using a consistent weight we can measure the prices against each other. Th...

(y+1)²= 4. The power of two becomes a square root on the other side. Don't forget that this is plus or minus the square root of 4. Now we have y+1 = +- sqrt(4). We now have two equations to sol...

[Method 1] The solutions need to add together to make 3 and multiply to make -28. For them to multiply and make a negative number one of the solutions must also be negative and the other positive (so ther...

5a x a = 5a² 5a x 3b =15ab 5a² + 15ab