For the official practise test 2, section 3, question 4 is listed as a “plugging in” question.

So when I tried it out, I substituted 1 for both variables a and b. That easily allows me to pick option A.

However, one of your rules was to never plug in the values 0 and 1, yet 1 was a viable option for this question.

So how can I know when plugging in 1 will be okay and when it’s a bad idea? Also, is my method correct for this question or would you suggest another way? Thanks so much!

# I was wondering if you could explain a little bit better question 2 of the “Binomial Squares and Difference of Two squares” Practice questions.

Hi Mike, I was wondering if you could explain a little bit better question 2 of the “Binomial Squares and Difference of Two squares” Practice questions. More particularly, I was wondering if there was a way to convert the equation to the right answer.

Thanks

# Test 1 Section 4 #36

Test 1 Section 4 #36

# Math Skills for the New SAT: Completing the Square

The new SAT requires you to know a number of special equation forms—to know which one you need to use in a given situation, and to know how to get into that form if it’s not the one you’re given by using algebraic manipulation. Some equation forms (vertex form of a parabola and the standard (more…)

# If x^2 + y^2 = 14 and xy = 3, which of the following is equal to (x + y)^2?

If x2 + y2 = 14 and xy = 3, which of the following is equal to (x + y)^2?

Could you go step by step?