We have to solve this quadratic equation
for n to get <em>which figure has 56 blocks</em>.

For middle term factorization, we need <em>two numbers that multiplied gives us -56 and added gives us 1 (coefficient of n).</em>
<em>Such two numbers are </em><em>8</em><em> and </em><em>-7</em><em>. We can now write,</em>
<em>
</em>
<u><em>"There is no negative figure number possible, so we disregard -8"</em></u>
Our answer is 7.
ANSWER: The 7th figure has 56 blocks.
Answer:

Step-by-step explanation:
well the values for x are from -2 to ∞
so we can write it as

Answer:
n = 4
Step-by-step explanation:
Unit: 1.14 Unit Test: Introduction to Logic and Euclidean Geometry - Part 1