Top answers

Solve x^2 + x - 2 = 0

(x+2)(x-1)=0 x+2=0x= -2x-1=0x=1
EW
Answered by Emily W. • Maths tutor
3428 Views

Describe the three main types of bonding?

Ionic bonding - occurs between a metal an a none metal. Electrons are transferred between two atoms to form ions - atoms with either a positive or negative charge. Ionic bonding occurs because of the strong ...
KM
10754 Views

How do you solve a simultaneous equation by 'substitution'?

Firstly, demonstrate with an example: Solve: 3x + y = -9 and x 2 + 2x - 3 = yRearrange the first equation to get "y" by itself by moving parts of the equation to the other side e.g. y = - 9 - 3xSub...
SH
Answered by Sophie H. • Maths tutor
3437 Views

What is the length of the hypotenuse of this right angled triangle?

Pythagoras theorem can be used to calculate the length x of the triangle. The length of the hypotenuse is equal to the square root of a 2 + b 2 . When given length a and b, you are able to calculate this len...
CA
Answered by Callum A. • Maths tutor
4213 Views

How do you form the preterite tense (el pretérito) for regular verbs?

The preterite tense in Spanish is used to talk about an action that has been completed. In order to conjugate a regular verb into the preterite tense we firstly need to find the stem of the verb, which we ge...
AC
Answered by Anjulie C. • Spanish tutor
4498 Views