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Find the x-intercepts of the graph y=x^2+2x

At the x-intercepts of the graph, the line crosses the x-axis. This means that the y-value at these points equals 0. We must therefore make x^2+2x equal to 0 and simplify the equation. x^2+2x = 0 is the same...
HH
Answered by Harry H. • Maths tutor
7252 Views

Mike, Sam and James play football. Mike scores 8 more goals than James. Sam scores 5 more goals than Mike. Altogether they score 72 goals. How many did Sam score?

Let James = x Mike = x+8 Sam = Mike+5 = (x+8)+5 = x+13 Altogether: James + Mike + Sam = 72 Therefore, x + (x+8) + (x+13) = 72 Now solve for x: 3x + 21 = 72 Bring 21 to the other side: 3x = 72-21 = 51 Divide ...
JR
Answered by Joshua R. • Maths tutor
4384 Views

How to use the quadratic formula, using the following equation: x^2 + 3x - 4

To begin you must identify the co-efficients of each x term, essentially what number comes before x 2 , x and the integer value. a = 1, b = 3, c = -4 . We then substitute these values into the quadratic form...
OB
Answered by Oliver B. • Maths tutor
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I know the formula, but I don't understand it.

A thorough understanding of all the mathematical formulas prescribed in the subject specification is crucial for your survival in the no-mans-land of the maths exam, where your examiner tries his best to mur...
LL
Answered by Le L. • Maths tutor
4083 Views

Bill buys 8 identical cricket balls. The total cost is £169.04 Work out the total cost of 19 of these cricket balls. (Calculator allowed).

Start by identifying the cost of one cricket ball: £169.04 ÷ 8 = £21.13 Next multiply this by the number of cricket balls he wants to buy: £21.13 x 19 = 401.47 The total cost of 19 cricket balls is £401.47
GJ
Answered by George J. • Maths tutor
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