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3 years ago

3x square + 4 x minus 15 is equals to zero

Mathematics

2 answers:

Anastasy [175]3 years ago

8 0

Answer:

x = -3 OR x = 5/3

Step-by-step explanation:

=> $3x^2+4x-15 = 0$

Using mid term break formula

=> $3x^2+9x-5x-15 = 0$

=> 3x(x+3)-5(x+3) = 0

Taking x-3 common

=> (x+3)(3x-5) = 0

Either

x+3 = 0 OR 3x-5 = 0

x = -3 OR x = 5/3

lisov135 [29]3 years ago

7 0

Answer:

x = 5/3 or x = -3

Step-by-step explanation:

3x² + 4x - 15 = 0

Factor left side.

(3x - 5)(x + 3) = 0

Set factors equal to 0.

3x - 5 = 0

3x = 5

x = 5/3

x + 3 = 0

x = -3

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Change 0.18 into a ratio

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3 years ago

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If angle PQR and angle RQS form a linear pair and angle PQR =5x+5 and angle RQS =11x-65 then angle PQR=?

Mama L [17]

Answer:

m<PQR = 80°

Step-by-step explanation:

Points to remember

Sum angles in a linear pair is 180

To find the value of x

It is given that, angle PQR and angle RQS are linear pairs, and

m< PQR =5x+5 and m<RQS =11x-65

m<PQR + m<RQS = 180

5x + 5 + 11x - 65 = 180

16x -60 = 180

16x = 180 + 60

16x = 240

x = 15

To find the value of angle PQR

m<PQR = 5x + 5

= 5*15 + 5

= 75 + 5 = 80

Therefore m<PQR = 80°

3 0

3 years ago

Scott and Harry went cycling every day. They increased the number of minutes of cycling every week as described below:

djyliett [7]

Answer:

(A)

Step-by-step explanation:

Scott cycled for 10 minutes in first week, 15 minutes in second week,20 minutes in third week and 25 minutes in the fourth week which maintains a consistency in the line as there is consistent slope when drawn on a graph.

On, the other hand, harry cycled for 10 minutes in first week, 20 minutes in second, 40 minutes in third and 80 minutes in fourth week in which there is no consistency in the timings according to the weeks. Therefore, only, scott's method is linear as the number of minutes increased by an equal factor every week.