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How do you solve the quadratic X^2 - 8X + 15 = 0 ?

First factorise (using a "farmer's field", will draw this on whiteboard):=> (X-3)(X-5) = 0Hence using the zero rule (one of the brackets must be equal to 0 if the product is 0),either X-3 = 0 OR...
SJ
Answered by Simone J. • Maths tutor
2997 Views

Explain the formation of a waterfall, describe the processes that happen in the making of this landform.

Waterfalls are ususally found in the upper section of the river course, this is because the bedrock in upper sections is of different degrees of hardness, composed of both hard and soft rock. The main proces...
LG
Answered by Louise G. • Geography tutor
4114 Views

Simplify fully the expression ( 7x^2 + 14x ) / ( 2x + 4 )

The first thing we try to do is factorise the numerator and denominator. Let's start with the numerator. We can take a 7 out of the bracket to leave us with 7( x 2 + 2x ) on the numerator. But we're not done...
CB
2852 Views

2x^2+21x=-40

2x 2 +21x+40=0factors of 40=1&40, 2&20, 4&10, 5&85 & 8 are correct factors as 5 + 2*8 = 21(2x+5)(x+8)=0So, x = -8 & -2.5
NM
Answered by Nirav M. • Maths tutor
3457 Views

What is the ' present subjunctive' tense and when should it be used?

The subjunctive is a form of a verb that is used to show a level of feeling , or doubt ; it is commonly used to discuss whether something will happen or not. In French, the subjective is also used when a sen...
EH
Answered by Elizabeth H. • French tutor
1807 Views