Solve the problem using a system of equations: The difference of the squares of two numbers is 30. The difference of the square of the first number and twice the square of the second number is 5. Enter two such numbers separated by a comma. For example −2,5. Leave the answer in radical form if applicable.

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answer: 1 + 1 = 11

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -